Nature Environment and Pollution Technology

Tanay Datta Chowdhury ¹, Md. Abu Zafor ¹, Amit Chakroborty ¹

Affiliations
1 Department of Civil Engineering, Leading University, Sylhet-3100, BD

Abstract

Groundwater is one of the important and prime sources of drinking water supply in Sylhet district (a region of Bangladesh). Iron is one of the abundant pollutants that exist significantly in this region’s groundwater. Here, the study signifies the spatial distribution of iron concentration across the whole district of Sylhet by using different geostatistical methods on the basis of collected data from 351 groundwater wells. The variation in the concentration of iron in Sylhet district is represented by using Geographic Information System (GIS), an effective tool used for mapping purpose. On the basis of GIS, ordinary kriging method is executed here for the estimation of groundwater iron concentration. Iron concentrations represent a normal distribution, as well as cross validation errors are within the satisfactory level. Among the five models (Spherical, Gaussian, Exponential, K-Bassel, J-Bassel) introduced by kriging in this study, the experimental variogram of groundwater iron concentration was best fitted by exponential model. The highest concentration is found in the mid region of Sylhet district as the geostatistical map signifies. Another key reason revealed from the study that, the greater the elevation of the ground surface, the higher the concentration of iron.

Keywords

Groundwater, Iron Concentration, Geostatistics, Ordinary Kriging.

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